Materials Literature
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Effects of negative current density on AZ31 anodizing in Na2SiO3,NaOH,C6H5Na3O7 electrolyte are researched in terms of the microstructure and corrosion resistance of anodic coating. Surface and cross-section morphologies are observed by SEM; coating compositions are analyzed by EDS and polarization curves are measured…
Cetyl trimetyl ammonium bromide,silane coupling agent KH 570 and polyethylene glycol were used to modify the surface properties of graphite separately. The modified graphite / nitrile rubber composites were prepared by mechanical blending,and the effects of the loading level of the filler and the kinds of modifiers on…
A new transition metal complex directed mercury thioantimonate,[dienH2]Hg2Sb2S6(dien = diethylenetriamine),has been synthesized by solvothermal reaction of HgCl2,Sb and S in diethylenetriamine solution at 400 K. The crystal structure was characterized by elemental analysis and single-crystal X-ray diffraction. The tit…
A new silicone oil with long alkyl ester and polyether epoxy groups( PEESO) has been synthesized by hydrosilylation of polyhydromethylsiloxane( PHMS) with stearyl methacrylate( SMA) and polyether epoxy groups in the presence of platinum 〔( trimethyl) cyclopentadienylplatinum 〕 catalyst. The factors affecting Si—H conv…
The electronic structures,spectra and charge inject and tansport properties of five pyridinecontaining anthracene derivatives were studied by DFT,HF,CIS,and TDDFT methods.The results indicate that the main structural changes occur in the twist angles between the molecular adjacent groups.These compounds have similar e…
The polyurethanes for high performance leather coatings were synthesized by using the low relative molecular mass polyester polyol as main raw material.The influence of the factors including polyester polyol relative molecular mass,chain extender types and their amounts,isocyanate index R,yellowing resistance auxiliar…
Manual arc welding was performed on D36 grade structural steel plate,the effect of preheating and heat preservation process on the microstructure and hardness of welded joints was analyzed and the corrosion behavior of weld seams with different process in simulated seawater was evaluated by electrochemical test. Resul…
Dynamic heat transfer of several common bast fiber(China-Hemp,flax,jute and ramie)were investigated under unsteady-state condition and compared with the cotton fiber. The dynamic temperature curves of fibers under high temperature(100 ℃)were measured by the self-built temperature collecting system,and the dynamic heat…
X-ray absorption fine structure( XAFS) was used to study the atomic and electronic structure of Au nanoparticles affected by three kinds of surfactants,triphenylphosphine( PPh3),dodecanamine( C12H27N) and dodecanethiol( C12H26S). XAFS and TEM results indicate that the surface interaction intensity between Au nanoparti…
Organic-inorganic hybrid flame retardant( DOPA-MH) was synthesized through grafting DOPA onto magnesium hydroxide. Fourier transform infrared spectra( FTIR) demonstrated that the hybrid flame retardant was synthesized successfully. Scanning electron microscopy( SEM) illustrated that the morphology of MH was not affect…
The refueling pod adaptor of an aircraft was found to have crack and leak during testing. The refueling pod adaptor was welding assembly. The crack was found near R angle of the cover plate,whose material is ZL116 alumium alloy. The failure mode and cause were analyzed by macro and micro observation,microstructure exa…
To further improve designers' ability in developing complex patterns and using all kinds of technology,this paper discussed the design and application of flat knitting,figure pattern and intarsia,with actual examples that were executed by M1 Plus system from STOLL.Weaving process and technical details were given.Key p…
As to the problems with heavy twisted yarn T 11.8tex including high tension,poor cohesion,instable splicing quality and filling contraction resulting from inadequte steaming and twist fixing,introduction is made to the production flow of the heavy twisted yarn in the winding process.Summerization is given to the essen…
The micro-structure and basic properties of domestic Nd-BRs with different Mooney viscosities were studied and compared with Ni-BR.The results showed that,compared to Ni-BR,Nd-BR possessed higher relative molecular weight,smaller molecular weight distribution index and larger content of linear molecular structure.In a…
Poly( butylene terephthalate)( PBT) / liner low density polyethylene( LLDPE) blends were prepared by using reactive melting compounding technology. In order to improve the compatibility of incompatible PBT / LLDPE blend, epoxidized EPDM( e EPDM) was used as a solubilizer. The effects of e EPDM on the melting crystalli…
The development of hot rolling technology for strip and plate during last 30 years in China was reviewed.After importation,digestion and absorption the hot strip rolling techniques and equipment,product innovation,and technology-equipment-products-service independent innovation,Chinese hot strip rolling technology has…
Tin free steel( TFS) strip is obtained after chromium plating on the surface of double cold rolling steel strip. The surface morphologies of TFS are effected by the surface quality of the steel substrate. In the production process,some white spots can be seen in partial products by visual observation,and the surface l…
To study the influences of PdO,CeO2on selective catalytic reduction(SCR)of NOx with methane,the PdO-CeO2/semi-coke catalysts were prepared by impregnation method with KOH-activated semi-coke as supports,PdO and CeO2as active components,and the influences of CeO2loading on temperature window,NOxreduction efficiency ove…
To better understand the effect of tin on the corrosion behavior of Zr-Sn-NbFe alloy,Zr-xSn-1Nb-0.3Fe(x=0-1.5)sheets were prepared and corroded by static autoclave in 360 ℃/18.6 MPa/0.01mol/L LiOH aqueous solution for 340 days.The characteristics of the precipitates were analyzed by TEM.The results show that the corro…
The effect of ionic strength on the chain conformations of high(712.6 kD), medium(205.8 kD) and low(76.4 kD) molecular weight chitosan was studied by intrinsic viscosity and static light scattering. Our results showed that the intrinsic viscosities and mean square radiuses of the three samples decreased with increasin…